Doctor: So, that's the trap. Or the test or the final judgment, I don't know. But if I kill you, I kill her. Except that implies, in this big grand scheme of Gods and Devils, that she's just a victim. But I've seen a lot of this universe. I've seen fake gods and bad gods and demi-gods and would-be gods - out of all that - out of that whole pantheon - if I believe in one thing... Just one thing... I believe in her.

"Torchwood" is an anagram for Doctor Who. Russell T Davies came up with it during the filming of Series 1 to label the tapes in order to prevent theft and potential leakage, and decided to use the name in the show proper.